'‘Whoever sleeps while in a state of purification then an Angel spends the night in his garment, he does not wake up at any time during the night except that the Angel says: O Allaah forgive Your slave such and such since he went to sleep upon purification.’'

[Collected by Abdullaah ibn al-Mubarak in 'Hadeethihi' & 'Zuhd', and Albaani declared it to have a Hasan Isnaad in Silsilah Saheehah no. 2539]